Two questions:
1. Some places offer "punch-card" discounts on gas, some offer "unlimited Nitrox" for a flat fee/year, and other places are "pay at the pump." Besides instructors who have arrangements with their LDS, what is everyone's preference, and what on average should one pay for fills (all special arrangements aside)?
2. I've also heard stories about divers getting short-fills on their HP tanks while on a trip (hypothetically say in the San Juan Islands for instance).
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Are there any easy ways to prevent this besides writing the fill pressure in big numbers on the tank? Should you check your tank pressures before leaving the shop (is it worth setting up an spg specifically for a quick tank check?) as asking for them to be topped off if they're short? I'm interested to hear what experience people have had with it. Thanks!
) we are somewhat "Hoovers" still, (though we're getting better! 
) and really appreciate the good fills. On Board they were only able to get Bassman's tank to about 3100 and it dropped considerably when he hit the water. (I beleive that this was due to compressor limitations, NOT the neglect of the one filling the tanks.) If he had realized that would happen he would have brought two tanks. On our second dive I surfaced with about 1200 PSI when we ended our dive because he was around 500. I would have LOVED the extra time to use that 700 PSI!! We were diving Big Cone Island and it was one of the prettiest, most colorful, most life filled dives I've had the pleasure of doing in my short year of diving.